/* Soot - a J*va Optimization Framework
 * Copyright (C) 2004 Jennifer Lhotak 
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */


package soot.jimple.toolkits.scalar;
import soot.SideEffectTester;
import soot.SootMethod;
import soot.Unit;
import soot.Value;
import soot.toolkits.graph.DirectedGraph;
import soot.toolkits.scalar.FlowSet;

/** Implements an available expressions analysis on local variables. 
 * pessimistic analysis - for teaching 621*/
public class PessimisticAvailableExpressionsAnalysis extends SlowAvailableExpressionsAnalysis 
{
    public PessimisticAvailableExpressionsAnalysis(DirectedGraph<Unit> dg, SootMethod m, SideEffectTester st){
        super(dg);
    }
    
    protected FlowSet<Value> newInitialFlow()
    {
        FlowSet<Value> newSet = emptySet.clone();
        //((ToppedSet)newSet).setTop(true);
        return newSet;
    }

}

